Electrodeposited conductive polypyrrole/polyaniline composite film for the corrosion protection of copper bipolar plates in proton exchange membrane fuel cells
Electrodeposited conductive polypyrrole/polyaniline composite film for the corrosion protection of copper bipolar plates in proton exchange membrane fuel cells
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DOI：
10.1016/j.jpowsour.2015.10.027
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发表时间：
2016-01
影响因子：
9.2
通讯作者：
T. Pan;X. Zuo;Tao Wang;J. Hu;Zhidong Chen;Y. Ren
中科院分区：
文献类型：
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作者：
T. Pan;X. Zuo;Tao Wang;J. Hu;Zhidong Chen;Y. Ren
采用电化学方法在铜基体上制备了一种由聚吡咯（PPY）内层和聚苯胺（PANI）外层组成的导电复合涂层。评价了这些复合涂层在质子交换膜燃料电池（PEMFC）中的潜在应用。通过电化学阻抗谱、极化和开路电位测量研究了无聚合物涂层和有聚合物涂层的铜基体在含有H2SO 4（0.2 M）、HCl（0.1 M）和HF（3 ppm）的酸性溶液中的腐蚀性能。结果表明，PPY/PANI双层膜和PPY单层膜均可使铜基体的自腐蚀电位提高250 mV（SCE）以上，腐蚀电流密度降低一个数量级。长期测试进一步证实，具有可接受的接触电阻的PPY/PANI双层涂层比单一PPY涂层对基底提供更好的保护。这种具有不同离子选择性渗透性质的双层结构可以作为腐蚀性物质向内渗透的有效物理屏障。
A conductive composite coating consisting of an inner polypyrrole (PPY) layer and an outer polyaniline (PANI) layer is prepared on a copper substrate by an electrochemical synthesis. Potential application of these composite coatings in a proton exchange membrane fuel cell (PEMFC) is evaluated. The corrosion performance of the copper substrate without and with the polymer coatings in the acidic solutions containing H2SO4(0.2 M), HCl (0.1 M) and HF (3 ppm) is investigated by electrochemical impedance spectroscopy, polarization and open-circuit potential measurements. The results indicate that both the bilayered PPY/PANI and the single PPY coating can increase the corrosion potential of copper substrate by more than 250 mV (SCE), and effectively decrease the corrosion current density by an order of magnitude in comparison with the uncoated copper substrate. Long-term test further confirms that the bilayered PPY/PANI coating with acceptable contact resistance provides better protection for the substrate than the single PPY coating. The bilayered structure with different ion-permselective nature may serve as an effective physical barrier to the inward penetration of corrosive species.